Add a shield stat to the post game report!
As someone who likes to play support, I always find it upsetting when there are so many stats to look at, but nothing for how much damage you mitigated.
For example, Janna shields tons of damage, but there is no way to see how much health she saved her team. Janna is one example but there are tons champions that have shields. It would be nice to see how effective they were, especially seeing as the new windspeaker will make them even more effective.
Since we are on the topic, two other stats that I think are important to recognize. Damage reduction provided: this is separate from shielding. This is, for instance, any time you give an ally more magic/armor. How much protection are you actually providing?
Damage bonus: This is for champions that can empower their allies. To use Janna as an example again, her shield gives her target bonus ad. It would be nice to see how well that is being utilized.
I don't know how Riots system works, but in my head this isn't the most complicated thing to implement. All that is needed is an INT that goes up every time a shield ticks down.
Speak up supports! Too long have our efforts to save our fellow champions gone unrecognized! Upvoting (or down) without commenting is a sin!